* it. If it arrives when before or after \ref gras_msg_wait, it will be
* passed to the callback.
*
- * For an example of use, please refer to \ref GRAS_ex_ping.
+ * For an example of use, please refer to \ref GRAS_ex_ping. The archive
+ * contains much more examples, but their are not properly integrated into
+ * this documentation yet.
*/
/** @defgroup GRAS_msg_decl Message declaration and retrival
* you can always say that it conveys a generic reference (see
* \ref gras_datadesc_ref_generic).
*
- * In order to ease the upgrade of GRAS applications, it is possible to \e version the messages, ie
- * to add a version number to the message (by default, the version is set to 0). Any messages of the
- * wrong version will be ignored by the applications not providing any specific callback for them.
+ * In order to ease the upgrade of GRAS applications, it is possible to \e
+ * version the messages, ie to add a version number to the message (by
+ * default, the version is set to 0). Any messages of the wrong version will
+ * be ignored by the applications not providing any specific callback for
+ * them.
*
- * This mechanism (stolen from the dynamic loader one) should ensure you to change the semantic of a given
- * message while still understanding the old one.
+ * This mechanism (stolen from the dynamic loader one) should ensure you to
+ * change the semantic of a given message while still understanding the old
+ * one.
*/
/** @{ */
/** \brief Opaque type */
* @{
*/
+ /** \brief Context of callbacks (opaque structure) */
+ typedef struct s_gras_msg_cb_ctx *gras_msg_cb_ctx_t;
+
+gras_socket_t gras_msg_cb_ctx_from(gras_msg_cb_ctx_t ctx);
+
/** \brief Type of message callback functions.
*
* \param expeditor: a socket to contact who sent this message
*
* If the callback accepts the message, it should free it after use.
*/
- typedef int (*gras_msg_cb_t)(gras_socket_t expeditor,
- void *payload);
+ typedef int (*gras_msg_cb_t)(gras_msg_cb_ctx_t ctx,
+ void *payload);
void gras_cb_register (gras_msgtype_t msgtype, gras_msg_cb_t cb);
void gras_cb_unregister(gras_msgtype_t msgtype, gras_msg_cb_t cb);
/** @} */
+
/** @defgroup GRAS_msg_exchange Message exchange
* @ingroup GRAS_msg
*
*/
/** @{ */
+
void gras_msg_send(gras_socket_t sock,
gras_msgtype_t msgtype,
void *payload);
gras_msgtype_t msgt_want,
gras_socket_t *expeditor,
void *payload);
+ void gras_msg_handle(double timeOut);
+
+/** @} */
+
+/** @defgroup GRAS_msg_rpc RPC specific functions
+ * @ingroup GRAS_msg
+ *
+ * Remote Procedure Call (RPC) are a classical mecanism to request a service
+ * from a remote host. Using this set of functions, you let GRAS doing most of
+ * the work of sending the request, wait for an answer, make sure it is the
+ * right answer from the right host and so on. Any exception raised on the
+ * server is also passed over the network to the client.
+ *
+ * Callbacks are attached to RPC incomming messages the regular way using
+ * \ref gras_cb_register.
+ *
+ * For an example of use, check the examples/gras/rpc directory of the distribution.
+ */
+/** @{ */
+
+/* declaration */
+void gras_msgtype_declare_rpc(const char *name,
+ gras_datadesc_type_t payload_request,
+ gras_datadesc_type_t payload_answer);
+
+void gras_msgtype_declare_rpc_v(const char *name,
+ short int version,
+ gras_datadesc_type_t payload_request,
+ gras_datadesc_type_t payload_answer);
+
+/* client side */
+void gras_msg_rpccall(gras_socket_t server,
+ double timeOut,
+ gras_msgtype_t msgtype,
+ void *request, void *answer);
+
+/* server side */
+void gras_msg_rpcreturn(double timeOut, gras_msg_cb_ctx_t ctx,void *answer);
+
+
+/** @} */
+
+/** @defgroup GRAS_msg_exchangeadv Message exchange (advanced interface)
+ * @ingroup GRAS_msg
+ *
+ */
+/** @{ */
+
+/** @brief Message kind (internal enum) */
+typedef enum {
+ e_gras_msg_kind_unknown = 0,
+
+ e_gras_msg_kind_oneway=1, /**< good old regular messages */
+
+ e_gras_msg_kind_rpccall=2, /**< RPC request */
+ /* HACK: e_gras_msg_kind_rpccall also designate RPC message *type* in
+ msgtype_t, not only in msg_t*/
+ e_gras_msg_kind_rpcanswer=3, /**< RPC successful answer */
+ e_gras_msg_kind_rpcerror=4, /**< RPC failure on server (payload=exception); should not leak to user-space */
+
+ /* future:
+ call cancel, and others
+ even after:
+ forwarding request and other application level routing stuff
+ group communication
+ */
+
+ e_gras_msg_kind_count=5 /* sentinel, dont mess with */
+} e_gras_msg_kind_t;
+
+
+/** @brief Message instance (internal struct) */
+typedef struct {
+ gras_socket_t expe;
+ e_gras_msg_kind_t kind;
+ gras_msgtype_t type;
+ unsigned long int ID;
+ void *payl;
+ int payl_size;
+} s_gras_msg_t, *gras_msg_t;
+
+typedef int (*gras_msg_filter_t)(gras_msg_t msg,void *ctx);
+
void gras_msg_wait_ext(double timeout,
gras_msgtype_t msgt_want,
gras_socket_t expe_want,
- int_f_pvoid_pvoid_t payl_filter,
- void *filter_ctx,
- gras_msgtype_t *msgt_got,
- gras_socket_t *expe_got,
- void *payl_got);
+ gras_msg_filter_t filter,
+ void *filter_ctx,
+ gras_msg_t msg_got);
- void gras_msg_handle(double timeOut);
/* @} */
